Questions
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Should we add a link from every page with main keyword back to homepage
IMO, those links in the footer do not help with rankings in Google. This is exactly what the "first link counts" anchor text test is about http://www.seomoz.org/blog/results-of-google-experimentation-only-the-first-anchor-text-counts You almost certainly are already linking to those pages higher up in the HTML, and Google is counting those anchors, and probably discounting the ones in the footer.
On-Page / Site Optimization | | randfish0